[bakon]

Originally Posted by psz752

I found: http://squirrelmail.org/plugin_view.php?id=21, why this solution isn't added in ISP manager? Should I install it manually?

Hello @psz752
I would recommend you to install roundcube webmail and add a button at it that:
a) With the API, let user change his own password
b) Go to Ispmanager and let the user change his own password.

We had option b) working